Ggp P320 Full Size Tb

If you're running a Sig Sauer P320 Full Size and want to shoot suppressed or thread a muzzle device, the Grey Ghost Precision P320 Full Size Threaded Barrel is a drop-in upgrade built for shooters who won't compromise on accuracy. GGP engineered this barrel from 416R stainless steel with match-grade tolerances, so you get the precision you'd expect from a competition or long-range build without the gunsmith bill. It's the kind of part that tells you the maker understands what serious shooters actually need—tight specs, reliable function, and a price that doesn't feel like a markup for a name.

The threaded barrel threads right into your P320 Full Size slide with zero fitting required. GGP holds final dimensions to ±0.003", which is tight enough to deliver shot-to-shot consistency where it matters. The 9mm Match chamber is cut to SAAMI specification, so it'll run factory ammo without hiccups, and the 1:10 twist rate is optimized for the caliber's typical bullet weights. Whether you're adding a can for hearing protection on the range or mounting a compensator for faster follow-ups, this barrel handles it.

GGP's team built their reputation on three principles: accuracy, reliability, and price. This barrel reflects that philosophy. It's the kind of upgrade that exists because working gunsmiths and competition shooters demanded it—not because marketing needed another SKU. If you shoot your P320 enough to notice the difference between a sloppy barrel and a tight one, this is for you.

Key Features

• 416R stainless steel, match-grade quality with ±0.003" dimensional tolerance for consistent accuracy
• Threaded for suppressors and muzzle devices
• Drop-in fit for Sig Sauer P320 Full Size—no gunsmithing required
• 9mm Match chamber to SAAMI specification
• 1:10 twist rate optimized for 9mm ballistics

Specifications

Frequently Asked Questions

Will this barrel fit my P320 Full Size without modification?

Yes. This is a drop-in barrel designed for the P320 Full Size. No gunsmithing or special fitting is required—it installs into your existing slide.

Can I use this barrel with a suppressor?

Yes, the barrel is threaded to accept suppressors and other muzzle devices.

What's the chamber spec?

This barrel has a 9mm Match chamber machined to SAAMI specification, so it runs standard 9mm factory ammunition reliably.

Why does the ±0.003" tolerance matter?

That level of precision tolerance means tighter fit between the barrel and breech, which translates to better shot-to-shot consistency and accuracy. It's the kind of spec you find in match-grade and competition barrels.